Let a and B Be Sets with Cardinal Numbers, N(A)= $\text { If } \mathrm { B } \subseteq \mathrm { A } , \mathrm { n } ( \mathrm { B } ) = \mathrm { n } ( \mathrm { A } - \mathrm { B } )$

question 65

True/False

Let A and B be sets with cardinal numbers, n(A)= a and n(B)= b, respectively. Decide whether the statement is true or false.
- $\text { If } \mathrm { B } \subseteq \mathrm { A } , \mathrm { n } ( \mathrm { B } ) = \mathrm { n } ( \mathrm { A } - \mathrm { B } )$

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